I believe most metals diffuse into other metals. It really a question of rates. There are also some major differences in the outcome depending on the difference in electronegativity between the metals.

Sodium and potassium metal (both soft solids, like cold butter) react most quickly because they are soft to begin with (atoms are mobile) end up making an alloy that is liquid at room temperature (

), which then dissolves the remaining solids and facilitating the mixing (

There are also much slower reactions, like that between gold and aluminum, which is known as a failure mechanism in devices where a gold wire is connected to an aluminum component, and takes weeks to manifest under normal conditions (https://en.wikipedia.org/wiki/Gold-aluminium_intermetallic). Interestingly, because the electronegativity of gold and aluminum are so different, the resulting compounds aren't really metallic, and are brittle and poorly conductive.... and white or bright purple!

Another interesting point is that hydrogen diffuses into and through many types of metal. It is actually quite soluble in iron and nickel, and can cause steel pipes to become brittle. I believe that aluminum in impervious, but I am not certain if it is because of the nature of the metal itself, or the protective oxide surface.

Hydrogen is not a metal as we know it, but supposedly does become metallic under extreme pressures, such as found at the core of Jupiter.

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